Repulsion-motor control.



F. EIGHBERG.

RBPULSION MOTOR CONTROL.

APPLICATION IILED NOV. 18, 1911.

1,093,983. Patented Apr. 21, 1 1:1

Pig/.

Wit/vesses; I /eNtOr:

H/sflttonvqg/ FRIEDRICH EICHIBERG, F BERLIN, GERIJEANY, ASSIGNOTS; TQ GENRE 13.11 ELECTRIC COMEA'NY, A COEIGRA'IIOE OF NE! REPU'LSIOILBIOTOE-i- CGNTRDL.

Application filed November 18, 1911. Serial No. 161,01?

7 b all whom it may concern Be it known that I, Fninnntcn Ernie nuns, a subject of the Emper r of Austria- Hungary, residing at Berlin, Germany, have invented certain new and useful Improvements in Repulsion-Motor Control, of which which--- Figures 1 and 2 are explanatory rliagrran'is and Fig. 3 shows diagrammatically a repulsion motor arranged in accordance with my invention.

Fig. 1 is a diagram of the well known repulsion motor in its simplest form. .1 represents the armature, B- B the short circuitecl commutator brushes and C the indusing winding on the stator on'which voltage is impressed "for operating the motor It is well known that such motor may be reversed by shifting the brushes. For instance, if the brushes BBare moved from the position shown in Fig. l in a clockwise direction across the dotted line a-(c-, the motor will run in the opposite direction. It is also well known in the art that the eiliciency and comn'iutation of a repulsion motor may be improved by impressing a voltage on the rotor winding through commutator hrushes in aclclition to that impressed on the stator \vindinq. Such an arrangement is shown in the diagram of Fig. 2*in which. D represents a transformer winding supplying the motor, and in which connectionsare established for impressing on the rotor winding through the commutator brushes a shunt voltage, the amount of which may be varied by moving the contacts cl. If in the arrangement of 2 the connections for impressing the shunt voltage on the brushes are so mails that this volt-a ge is of the proper phase with respect to the voltage induced between the brushes by the inducing winding with the brushes in the position shown, then if the brushes are moved. in a clockwise direction acri the clotted lines (t--1l.'l.0 reverse the motor, the relative phases of the Q" inrpressed on the brushes aiul the VUlL rein (lucetl between the h ashes will not be con rect because the intluceilvoltage is reverseil 0 in phase by shiftingihc brushes as above dc scriberl.

The purpose of my lK'IVQHlLlOILlS to permit the reversal of a motor connected as in Fig.- Q- in as simple a manner as is possible with that of 1 while preserving the proper phase relations between the impressed and inclucecl voltages at the commutator brushes. An rent suitable for this purpose is shown in i. The movable hrush holder 76 yoke is show-i at with a suitable handle inrlica ecl at c. on ahis yoke are carried segmental cents on which fixed brushes j. These contacts and brushes are included in the co? ctions through which 7 5 the shunt volt-ag impressed on the cominutator hrus i. El hen the brush holder yoke is movecl in a clockwise direction to reverse themotor, the contacts F slide out from under the brushcsf opening the 80" circuit of these brushes, when the commutator brushes l3 reach the position incli v cated by the clottecl lines (A -a in Figs. 1 and 2. this position no voltage induced in the armature by the winding (1. As the motion of the yoke is continued each segment ll comes into engagement with the other brush f, so that at the same time that the '7 of the induced voltage between the commutator in'ushcs is reversed. by shifting 9O them to reverse the n otor, the phase of the shunt vclti nprc on his also reve erl so th.

same.

1 do not desire to limit myself to the particular construction autl arrangement of parts shown and described. hutnim in the appended claims to cove all modifications which are wi 'iin the scope of my invention.

l i hat clam as new and desire to secure by Letters P'acent oi the Unite-ti States, is-

1. In combination, an alternating current motor of the commutator type haying an inducing winding and. an inrlucecl winclin'g locally short circuiteil through commutator brushes, 1305116 I to impressing voltages on both tht 9' w'incling and the in laced wine-L ns for shifting the brushes to iwersc the motor, and means inducing winding and an induced windmg locally short circuited through commutator brushes, connectlons for impressing voltages on both the lnduclng winding and the 111- .duced winding, a brush holder yoke which is movable for reversing the motor, and means carried by sald yoke for reversing the phase of the voltage impressed on'the 1nduced winding when said'vyoke is shifted toreverse the motor. I

In combination, an alternating current notor of the commutator type having an inucing Winding and an induced avinding cally' short circuited through commutator brushes, connections roi impressing voltages on both the inducing Winding and the in duced Winding, a brush holder yoke comprising two segmental contacts secured together but insulated from each other, a brush secured to substantially the vmiddle point of each of the segmental contacts and adapted to bear on the commutator ofthe motor, additional brushes connected to the source of impressed Voltage for said induced winding and adapted to bear on said segmental contacts, and means for shifting the position of said segmental contacts.

In'Wit'ness whereof, I have hereunto set my hand this 81st day of October, 1911.

FRIEDRICH EICHBERG.

\Vitnesses IWAN Dom LUDWIG M 

